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/*

 * INTC device simulation in PKUnity SoC

 *

 * Copyright (C) 2010-2012 Guan Xuetao

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation, or any later version.

 * See the COPYING file in the top-level directory.

 */

#include "hw/sysbus.h"

#undef DEBUG_PUV3

#include "hw/unicore32/puv3.h"

typedef struct {

    SysBusDevice busdev;

    MemoryRegion iomem;

    qemu_irq parent_irq;

    uint32_t reg_ICMR;

    uint32_t reg_ICPR;

} PUV3INTCState;

/* Update interrupt status after enabled or pending bits have been changed.  */

static void puv3_intc_update(PUV3INTCState *s)

{

    if (s->reg_ICMR & s->reg_ICPR) {

        qemu_irq_raise(s->parent_irq);

    } else {

        qemu_irq_lower(s->parent_irq);

    }

}

/* Process a change in an external INTC input. */

static void puv3_intc_handler(void *opaque, int irq, int level)

{

    PUV3INTCState *s = opaque;

    DPRINTF("irq 0x%x, level 0x%x\n", irq, level);

    if (level) {

        s->reg_ICPR |= (1 << irq);

    } else {

        s->reg_ICPR &= ~(1 << irq);

    }

    puv3_intc_update(s);

}

static uint64_t puv3_intc_read(void *opaque, hwaddr offset,

        unsigned size)

{

    PUV3INTCState *s = opaque;

    uint32_t ret = 0;

    switch (offset) {

    case 0x04: /* INTC_ICMR */

        ret = s->reg_ICMR;

        break;

    case 0x0c: /* INTC_ICIP */

        ret = s->reg_ICPR; /* the same value with ICPR */

        break;

    default:

        DPRINTF("Bad offset %x\n", (int)offset);

    }

    DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);

    return ret;

}

static void puv3_intc_write(void *opaque, hwaddr offset,

        uint64_t value, unsigned size)

{

    PUV3INTCState *s = opaque;

    DPRINTF("offset 0x%x, value 0x%x\n", offset, value);

    switch (offset) {

    case 0x00: /* INTC_ICLR */

    case 0x14: /* INTC_ICCR */

        break;

    case 0x04: /* INTC_ICMR */

        s->reg_ICMR = value;

        break;

    default:

        DPRINTF("Bad offset 0x%x\n", (int)offset);

        return;

    }

    puv3_intc_update(s);

}

static const MemoryRegionOps puv3_intc_ops = {

    .read = puv3_intc_read,

    .write = puv3_intc_write,

    .impl = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static int puv3_intc_init(SysBusDevice *dev)

{

    PUV3INTCState *s = FROM_SYSBUS(PUV3INTCState, dev);

    qdev_init_gpio_in(&s->busdev.qdev, puv3_intc_handler, PUV3_IRQS_NR);

    sysbus_init_irq(&s->busdev, &s->parent_irq);

    s->reg_ICMR = 0;

    s->reg_ICPR = 0;

    memory_region_init_io(&s->iomem, &puv3_intc_ops, s, "puv3_intc",

            PUV3_REGS_OFFSET);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static void puv3_intc_class_init(ObjectClass *klass, void *data)

{

    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);

    sdc->init = puv3_intc_init;

}

static const TypeInfo puv3_intc_info = {

    .name = "puv3_intc",

    .parent = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(PUV3INTCState),

    .class_init = puv3_intc_class_init,

};

static void puv3_intc_register_type(void)

{

    type_register_static(&puv3_intc_info);

}

type_init(puv3_intc_register_type)